package com.example.springdemo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.TaskExecutor;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * AsyncConfig
 * 线程池的配置
 *
 * @author wenguang
 * @date 2020/12/14 19:10
 */
@Configuration
@EnableAsync
public class AsyncConfig {

    private static final int MAX_POOL_SIZE = 10;

    private static final int CORE_POOL_SIZE = 5;

    //@Bean("asyncTaskExecutor"),名称用于 @Async("asyncTaskExecutor")
    //@Bean
    @Bean("asyncTaskExecutor")
    public TaskExecutor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(CORE_POOL_SIZE);
        // 设置最大线程数
        executor.setMaxPoolSize(MAX_POOL_SIZE);
        // 设置队列容量
        executor.setQueueCapacity(20);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix("async-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }
}

